Telegraph-xnstrument



G. B. CARR. TELEGRAPH INSTRUMENT.

No. 476,730. Patented June 7, 1892.

Imzentor.

v [MA/Jim UNITED STATES PATENT OFFICE.

CHARLES E. CARR, OF ST. J OHNSBURY, VERMONT.

TELEGRAPH-INSTRUMENT.

SPECIFICATION forming part of Letters Patent No. 476,730, dated June 7, 1892.. Application filed January 7, 1892. Serial No. 417,831. (No model.)

To all whom, it may concern.-

Be it known that I, CHARLES E. CARR, a citizen of the United States, residing at St. Jol'msbury, county of Caledonia, State of Vermont, have invented a new and useful Improvement in Telegraph Instruments, of which the following is a description.

Referring to the drawings, Figure 1 is aside View. Fig. 2 is a plan elevation. Fig. 3 is a cross-section on line Y Y of Fig. 1.

Similarletters refer to similar parts throughout.

I am aware that combination telegraph sets have been made before; but in manycases the combination is effected by mounting each separate instrument on one base without materially changing their construction, each being complete and practically separate in itself, while in mine a necessary part of one instrument forms an indispensable part of the other. This part, which may be called the backbone, is marked 0 in the drawings. It is brought up between the coils b of the sounder S, is fork-shaped to form the customary striker (Z for the armature-bar a, is carried over and between the coils e of the relay R, carried up f over the relay-armature g in the form of a fork, and is provided with the customary insulated point h on one side and platinum t' on the other. Both ends of this casting 0 rest on the metal base j, which is made hollow to secure a greater depth of sound. The relay-coils 6, covered with hard rubber, may be adjusted by means of a bearing-screw and spring 0 1, any lateral motion being prevented by the castings, which is here titted down between the coils, as shown in Fig. 3. On the back of the base are two bindingposts marked M, connecting the key K and relayR with the main line, also two marked L, connecting sounder S with the local line- These letters are to appear permanently on' said binding-posts. The trunnion-screws p 19, holding the relay-armature, must be separated from basej by some insulating material. The key K is of the usual construction, the trunnion-posts v" 7" being part of the basej.

WVhat I claim as my invention, and desire to secure by Letters Patent, is as follows:

In a combined telegraph sounderand relay, an arm extending from the sounder to the relay and bearing on each end a fork, and each fork provided with the usual adj listing-screws for limiting the play of the armature-bars of the respective instruments, substantially as described, and for the purposes set forth in my specification.

CHARLES E. CARR.

Witnesses:

W. L. KINNEY, W. H. SARGENT. 

